Febrile convulsions are one of the most common convulsions in pediatric patients, and the vast majority have a good prognosis. A febrile convulsion is defined as a first episode between 3 months and 4 to 5 years of age, a sudden onset of convulsions when the body temperature is above 38°C in the early stages of upper sensory or other infectious diseases, exclusion of intracranial infections and other organic or metabolic abnormalities that cause convulsions, and no previous history of fever-free convulsions. The etiology is mostly associated with several factors such as genetics, age, fever, and infection. The clinical data are divided into two types: 1. Simple febrile convulsions mostly start between 6 months and 4 years of age, with convulsions occurring soon after high fever and lasting less than 5-10 minutes, with generalized, bilateral convulsions, normal nervous system before and after the attack, and normal EEG one week after fever subsides. The prognosis of this type is good. 2. Complex febrile convulsions start at any age and can occur within 6 months or above 6 years of age; convulsions occur when there is hypothermia or no fever; the duration of convulsions is more than 15-30 minutes, frequent episodes of febrile convulsions are more than 5 times, the convulsions are obviously limited or obviously left-right asymmetry; there are neurological signs; there is a history of traumatic brain injury or cerebral hypoxia; there are abnormal changes in the EEG one week after fever subsidence. The prognosis of this type is poor. EEG manifestations: When the EEG was examined within one day after the initial febrile convulsion, most of them had a significant increase of slow waves distributed in all conduction, and most of them were in the occipital region, sometimes asymmetrical on both sides, and it is generally believed that such EEG changes are not meaningful for the prognosis evaluation. Abnormal EEG changes are rarely seen in children under 2 years of age with febrile convulsions. For example, the presence of abnormal EEG changes such as spikes, spikes, spikes and slow waves, and high amplitude slow waves is meaningful for the evaluation of prognosis. The abnormal discharges are mainly symmetrical and synchronized, and only a minority, about 10%, are restrictive. These changes suggest an increased risk of recurrence of febrile convulsions and subsequent conversion to epilepsy. As the age of febrile convulsions increases, the number of abnormal EEG changes also increases. There is variation in the selection of cases because of the inconsistent definition of febrile convulsions, but in general the prognosis of febrile convulsions is good and brain damage or sequelae due to severe convulsions are rare.